People from around the world will line up parallel to the Amtrak rail lines on Camino Capistrano Road Saturday to moon the passing trains.

The OC Register's Kyle Dalyreports that the tradition started 32 years ago at Mugs Away Saloon when a man offered to buy a round of beer for anyone who dared air their derriere toward the nearby train. Several people took up his offer and then reminded him of it the next year.

The tradition stuck, although it's lost some steam over the past three years.

OC Weekly/ Chris Victorio

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Law enforcement got involved after a shitstorm in 2008. Reports show that about 8,000 to 10,000 attended that year, Daly writes, and that the following April the city council outlawed public alcohol consumption, urination and defecation.

In 2009 only about 400 asses were on display, the article says, and last year's attendance peaked at about 100.

If you want to bare down at tomorrow's all-day event, or just look at more bare bums than a brothel can boast, head to the Mugs Away Saloon at 27324 Camino Capistrano and leave your underwear and inhibitions at home.

Check out our past slideshows of some fine -- and not-so-fine -- asses at the Amtrak mooning: